ones.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
#ifndef CXXUTILS_ONES_H
#define CXXUTILS_ONES_H
 
 
namespace CxxUtils {
 
 
template <class T>
inline
constexpr T ones (unsigned int n)
{
  if (n >= sizeof(T) * 8)
    return ~static_cast<T>(0);
  // cppcheck-suppress shiftTooManyBits
  return (static_cast<T>(1) << n) - 1;
}
 
 
} // namespace CxxUtils
 
 
#endif // not CXXUTILS_ONES_H